[Bug] Tensor.fromImage() in webworker

[reinhrst]

The offending line is

onnxruntime/js/common/lib/tensor-factory-impl.ts

Line 155 in bd60add

if (canvas instanceof HTMLCanvasElement) {

instanceof HTMLCanvasElement fails because HTMLCanvasElement does not exist in a worker.

Adding some typeof HTMLCanvasElement !== undefined && in the if statement, should fix it

[reinhrst]

As long as the patch is not yet merged, a quick solution is to add the following line to your code:

globalThis.HTMLCanvasElement = OffscreenCanvas